Engine issues

[cfan10]

When I start the engine for the first time of the day, it actually sounds like rolling on a flat tire. Never heard an engine sound like that before. Grinds sometimes a little bit. Oil gauge does not work properly.
Any suggestions? My mom is on me to get rid of it and buy something newer.

Side note: when I clean the throttle body it runs better. And doesn't seem to kill at stop lights. But does rev itself when idling. I'm starting to think 90 was the worst year for gm. My oldest brother had a 90 camaro in high school bought brand new, gave nothing but problems, and he drives like an old lady.

90 suburban 350TBI